Abstract
SBA-15 and metal doped SBA-15 with different metal special ratios were prepared using Pluronic P123 as a structure-directing agent. SBA-15 and metal doped SBA-15 were extensively characterized via N2 adsorption–desorption isotherm analysis, small-angle X-ray diffraction (SXRD), and Fourier transform infrared (FT-IR) analysis. The hydrothermal stability of the obtained mesoporous materials was tested in a stainless autoclave at 593 K for 1 h. Results of adsorption–desorption isotherm analysis, transmission electron microscopy, and SXRD revealed that metal doping improved the hydrothermal stability of SBA-15. Metal species and their molar ratios also contributed to the enhancement of hydrothermal stability. SXRD results showed that the diffraction peaks of metal doped SBA-15 shifted to higher 2θ degrees possibly because of framework constriction. FT-IR results indicated that the decrease in doped SBA-15 surface hydroxyl groups and hydrophilicity may be responsible for the improvement in hydrothermal stability after the introduction of heteroatoms. This work may serve as a reference for exploiting mesoporous materials with a hydrothermal stability and catalytic performance under aqueous conditions at high temperatures.
Published Version
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